Mandy Convinces Princess Eleanor to Wear a Rare Diamond to Her Birthday Party, But Is It All Part of Her Shady Scheme? Watch!

In this clip from Sunday's all-new episode of The Royals, Mandy encourages Princess Eleanor to wear the Koh-I-Noor Diamond, a rare jewel protected in the palace, to her upcoming birthday bash. But unbeknownst to the Princess, it's only part of her shady plan to steal it!

"You have to. You're the birthday girl," she says. "You get what you want. Just have them set it in a necklace and voilà!"

But Eleanor isn't so sure. "It's not even mine though," she responds. "It belongs to the people."